/*
 * Licensed to Elasticsearch B.V. under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch B.V. licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package co.elastic.apm.servlet;

import javax.annotation.Nullable;
import java.io.File;
import java.io.FileFilter;
import java.util.Arrays;

public class AgentFileAccessor {

    static String getPathToJavaagent() {
        return getTargetJar("elastic-apm-agent");
    }

    static String getPathToAttacher() {
        return getTargetJar("apm-agent-attach-cli");
    }

    static String getPathToSlimAttacher() {
        return getTargetJar("apm-agent-attach-cli", "-slim.jar");
    }

    @Nullable
    private static String getTargetJar(String project) {
        return getTargetJar(project, ".jar");
    }

    @Nullable
    private static String getTargetJar(String project, String extension) {
        File agentBuildDir = new File("../../" + project + "/target/");
        FileFilter fileFilter = file -> file.getName().matches(project + "-\\d\\.\\d+\\.\\d+(\\.RC\\d+)?(-SNAPSHOT)?" + extension);
        return Arrays.stream(agentBuildDir.listFiles(fileFilter)).findFirst()
            .map(File::getAbsolutePath)
            .orElse(null);
    }

}
